Device in rotary machines useful as pumps, motors and fluid meters



March30, 1965 s. RYDBERG 3,175,507

` DEVICE IN ROTARY MACHINES USEFUL AS PUMPS, MOTORS AND FLUID METERS Filed May 3, 1962 2 Sheets-Sheet l INVENTOR Sverker Rydberg March 30, 1965 S. RYD RG DEVICE IN ROTARY MACHINES AND FLUID METERS Filed May 5, 1962 3,175,507 EFUL As PUMPS, MOTORS 2 Sheets-Sheetl 2 /3 33 l2 30 35 T T I i Q M I 7 5 5 37 INVENTOR S Ver/(er Rydbe/g United States Patent C) 3,175,507 DEVICE IN ROTARY MACHINES USEFUL AS PUMPS, MOTORS AND FLUID METERS Sverker Rydberg, Linkoping, Sweden Filed May 3, 1962, Ser. No. 192,199 Claims priority, application Sweden, May 5, 1961,

4,731/61; Sept. 14, 1961, 9,137/61 3 Claims. (Cl. 10S- 149) This application is a continuation-in-part of my earlier led application, Serial No. 153,971, filed November 21, 1961 now Patent No. 3,152,553.

This invention relates to a device for use as a rotary machine such as a pump, motor, fluid meter or the like, and pertains particularly to the construction of the diaphragm and housing for such devices and to means for retaining the diaphragm in its desired position.

In rotary machines useful as pumps, motors and uid meters, it is known to mount at least one roller on a crank or eccentric, which roller is adapted to roll against a bead on the inside of a cylindrical, elastic rubber diaphragm, which diaphragm is disposed over a groove on the inside of a cylindrical housing whereby the diaphragm may be pressed against the groove as the roller moves against the bead. The diaphragm is so adapted as to be securely held at its ends by two flanges, one of which is outwardly directed and clamped between the housing cover and the housing, the other of which is inwardly directed and clamped against the other end Wall of the housing by a rigid flange and skirt. In such machines there have also been provided an external ridge, parallel to the axis of the machine, and disposed so as to sealingly enter into a corresponding groove in the housing, which groove is parallel to the axis of the housing and is situated between the outlet and inlet openings to the groove which is engaged by the diaphragm.

It is an important object of this invention to provide a device in such rotary machines characterized by the feature that the diaphragm, on its side opposite to the bead, is provided with a groove in opposed relationship to the bead, the groove in the housing being provided with a convex or concavo-convex bottom made to tit the shape of the groove in the diaphragm when the diaphragm is pressed against the groove in the housing by the roller acting against the bead.

A yet further object of this invention is to provide a clamping device for such machines which makes it pos- ""-sible to dismantle and assemble the machines extremely quimy for inspection, cleaning and diaphragm replacement, which clamping device is constructed in such a manner that it is in engagement with a bushing formed as part of the skirt which retains the inwardly directing flange in position, and which extends through the central opening in one end of the housing whereby the clamping device may be utilized to draw the bushing outwardly.

The invention is illustrated in the annexed drawings, wherein:

FIGURE 1 is an elevational view of one end of a rotary pump or the like embodying the present invention, the cover plate being removed for purposes of illustration;

FiG. 2 is a sectional view taken on line 2-2 of FIG. 1 and showing the diaphragm seated in the groove;

FIG. 3 is a fragmentary view of a modified form of the invention showing the diaphragm spaced from the groove;

FIG. 4 is a View similar to FIG. 3 and showing the diaphragm seated in the groove;

FIG. 5 is a View similar to FIGS. 3 and 4 but showing the diaphragm spaced further from the groove than is shown in FIG, 3; and

FIG. 6 is a sectional View of a yet further form of the lCC invention showing the manner in which the clamping device cooperates with the machine.

In the form of the invention illustrated in FIGS. 1 and 2, the device includes a cylindrical housing 3 with a plain rigid side 2, the housing being provided, in its interior cylindrical casing surface, with a groove 1 in which the sides slope toward the convex bottom 7. This groove 1 extends around the inner periphery of housing 3 but is interrupted at one point by a slightly deeper axial groove 4.

There is disposed within the housing 3 and in contact therewith, an elastic rubber diaphragm 5 in the form of a cylinder which, at the end adjacent side 2 of the housing, is provided with an inwardly directed flange 6 and at the other end with an outwardly directed flange 11 disposed so as to contact the edge of the housing 3 and to be held fast there by means of a removable side piece or cover plate 12.

Immediately above the groove 1 in the housing, the diaphragm cylinder 5 is provided with a bead 8 which has either a flat or convex top 24, which bead 8 joins up to the diaphragm cylinder 5 in such a manner as to form recesses 20. On the outside, the diaphragm cylinder 5 is provided with a groove 23 which in cross section is substantially semicircular in shape and formed in such a way that the thickness of the material between the groove 23 and the recesses 20 and the top 24 of the bead is substantially the same as the thickness of the diaphragm cylinder 5.

The cylindrical portion of the diaphragm 5 is provided on its outer side with an axial ridge 26 which is adapted to sealingly fit into the axial groove 4 in the periphery of the housing 3. It has been proved advantageous to provide this ridge 26 with an axial bore through which a pin 27 is adapted to pass and enter into corresponding recesses in the side 2 and the housing cover plate 12 so that the ridge 26 is retained in groove 4.

The bead 8 does not extend all along the entire inner periphery of the diaphragm 5 but at the point thereon opposite the axial ridge 26 of the diaphragm 5 it runs into elimination. The inwardly directed flange 6 of the diaphragm 5 is kept pressed against the rigid side 2 of the housing by means of a rigid flange 9 which is secured to the housing side 2 through screws 10.

The side 2 of the housing 3 is provided with a central opening 13 as is also the bottom 6 of the diaphragm 5 for the shaft 14 of a rotor 15 disposed in the housing 3. The shaft 14 is journalled in the opening 13 and also in a bearing 16 mounted in the housing cover 12.

The rotor is provided with two or three arms 17 which carry rollers 18 having axial bearing pins 19. The rollers 18 are adapted to roll against the bead 8 and to press, through the intermediary of the same, the diaphragm 5 against the bottom 7 of the groove 1. The width of the rollers 18 is substantially the same as that of the bead S.

The rigid ange 9 is provided yat its periphery with a cylindrical skirt 21 extending toward the bead S and engaging the inside of the diaphragm 5, and the housing cover plate 12 is provided on its inside with a corresponding cylindrical skirt 22.

The housing 3 is provided in the known manner with inlet and outlet openings 28 and 29 connecting to both ends of the groove 1, and the housing 3 is also provided with feet 25 for securing the same to a base plate 0r the like.

The modified form of the invention illustrated in FIGS. 3-5 differs from lthe embodiment of the invention shown in FIGS. 1 and 2, primarily in that the rigid flange 9 is of a different configuration and is provided with a bushing 3i) projecting through the opening 13 in the side 2 of the housing. The bushing 30 is provided with a nut 31 arranged to draw it upwardly and thus press the rigid flange 9 against the side 2 of the housing. The skirts 21 and 22 also are of a different configuration, all as illustrated lin FIGS. 3-5 of the drawings. Y

The embodiment of the invention shown in FIG. 6 differs from the embodiment shown in FIGS. 3-5 in that the bushing 30 on `"the outer side Vof the side 2 of the housing 3 is provided with a recess in the form of a circumferential groove 32 in the external periphery of the bushing 30.

The outer surface of side 2 of the housing 3 is provided with ridges 35 at least at two diametrically opposed positions on the periphery of the housing 3.

Two double-armed levers 33 and 39; are each adapted to engage, by a notch 34 between their arms 33 and 39, a corresponding ridge 35, and to engage the groove 32 in the bushing 30 by their inwardly directed arms 33. rPie rods 36 are pivoted at one end thereof to the outwardly directed arms 39, and the opposite ends of the tie 1rods 36 are pivoted to a U-clamp 37 mounted over the housing cover 12 and provided at its center with a.

screw 38 engaging the cover plate 12.

Thus, the component parts ofthe device are held in an operative position by levers 33 and 39, Vtie rods 36, clamp 37 and screw 38, tightening of the screw 38 serving to urge the bushing 30 outwardly through the linkage above described whereby to retain the inwardly directed flange 6 in tight engagement with the end 2 of the housing. lt will be further noted that the machine may be quickly dismantled for inspection, cleaning and diaphragm replacement, and then easily and quickly re-assembled through the utilization of the clamping device illustrated in FIG. 6.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. A rotary pump comprising a cylindrical housing having a concave `groove formed on the'inner face thereof; a cylindrical diaphragm carried within said housing and disposed over said groove; a bead on the inner face of the diaphragm; an outwardly directed ange at one end of said diaphragm; a cover plate clamping said flange to said housing; an inwardly directed flange at the opposite end of the diaphragm, said ange defining a central opening adapted -to receive a driving shaft; a roller yadapted to roll against said bead and in doing so to press said diaphragm into saidv groove in the housing; an axial rib on the outer face of said diaphragm and adapted to fit within a corresponding slot formed in the housing between an inlet and an outlet opening in communication with Ysaid groove, said axial rib having a bore extending therethrough and adapted to receive a pin for eng-agement with said cover plate whereby to retain said rib in said slot; a bushing carried within said central opening and having a skirt lthereon in engagementwith said inwardly directed flange; and means coupled with said bushing whereby to draw the same outwardly with respect to said housing and thereby maintain said skirt in tight 'engagement with said inwardly directed flange;

2. Theinvention as set forth in claim V1, wherein said means for drawing the bushing outwardly comprises a nut lthreaded :on the bushing.

` v3. A casing for a rotary pump having ya housing and a bushing extending outwardly therefrom, said casing comprising a clamping device for drawing the bushing outwardly with respect to the housing, said device having tie rods which are operably'coupled at one end thereof n with the outer ends of a pair of radially disposed levers,

i References Cited by the Examiner FOREIGN PATENTS 768,253 2/57 Great Britain.

785,597 10/57 Great Britain.

LAURENCE v. EFNER, Primary Examiner. 

1. A ROTARY PUMP COMPRISING A CYLINDRICAL HOUSING HAVING A CONCAVE GROOVE FORMED ON THE INNER FACE THEREOF; A CYLINDRICAL DIAPHRAGM CARRIED WITHIN SAID HOUSING AND DISPOSED OVER SAID GROOVE; A BEAD ON THE INNER FACE OF THE DIAPHRAGM; AN OUTWARDLY DIRECTED FLANGE AT ONE END OF SAID DIAPHRAGM; A COVER PLATE CLAMPING SAID FLANGE TO SAID HOUSING; AN INWARDLY DIRECTED FLANGE AT THE OPPOSITE END OF THE DIAPHRAGM, SAID FLANGE DEFINING A CENTRAL OPENING ADAPTED TO RECEIVE A DRIVING SHAFT; A ROLLER ADAPTED TO ROLL AGAINST SAID BEAD AND IN DOING SO TO PRESS SAID DIAPHRAGM INTO SAID GROOVE IN THE HOUSING; AN AXIAL RIB ON THE OUTER FACE OF SAID DIAPHRAGM AND ADAPTED TO FIT WITHIN A CORRESPONDING SLOT FORMED IN THE HOUSING BETWEEN THE INLET AND AN OUTLET OPENING IN COMMUNICATION WITH SAID GROOVE, SAID AXIAL RIB HAVING A BORE EXTENDING THERETHROUGH AND ADAPTED TO RECEIVE A PIN FOR ENGAGEMENT WITH SAID COVER PLATE WHEREBY TO RETAIN SAID RIB IN SAID SLOT; A BUSHING CARRIED WITHIN SAID CENTRAL OPENING AND HAVING A SKIRT THEREON IN ENGAGEMENT WITH SAID INWARDLY DIRECTED FLANGE; AND MEANS COUPLED WITH SAID BUSHING WHEREBY TO DRAW THE SAME OUTWARDLY WITH RESPECT TO SAID HOUSING AND THEREBY MAINTAIN SAID SKIRT IN TIGHT ENGAGEMENT WITH SAID INWARDLY DIRECTED FLANGE. 